ROB, there is no machlokes, hence the halachah can be like both. One can’t arbitrarily avoid his obligation to teach a profession, but can be mechanech his son in Toraso umnaso.
Your assumptions that the entire yeshivah world, with the encouragement of its gedolim, is in blatant violation of halachah is insulting, arrogant, and ignorant.
You are not better informed than them.